AVIF support

[onzecki]

eightyeightthirtyone currently does not scrape/save AVIF 88x31 images.
This could be fixed by bumping the version of image-rs to the latest version (0.25.2 at the time of writing) and adding the "avif-native" feature.¹
Alternatively it seems that enabling the "avif-decoder" feature on 0.24.8 might work as well.²

¹ https://docs.rs/image/latest/image/codecs/index.html
² https://docs.rs/image/0.24.8/image/codecs/avif/struct.AvifDecoder.html